TRENTON, N.J. — Ranbaxy Pharmaceuticals has recalled dozens of lots of its generic version of cholesterol drug Lipitor because some may contain tiny glass particles, the latest in a string of manufacturing deficiencies that once led U.S. regulators to bar imports of the Indian company's medicines.

Ranbaxy, a subsidiary of Ranbaxy Laboratories, India's biggest drugmaker, is operating under increased scrutiny from the U.S. Food and Drug Administration because of quality lapses at multiple Ranbaxy factories over the past several years. The FDA also has alleged the company lied about test results for more than two dozen of its generic drugs several years ago.

On Friday, Ranbaxy posted a notice on its U.S. website, saying it's recalling 10-, 20- and 40-milligram doses of tablets of atorvastatin calcium. That's generic Lipitor, the cholesterol fighter that reigned for years as the world's top-selling drug.

The recall includes 41 lots of the drug, nearly all with 90 pills per bottle, but three lots contain 500 pills per bottle. It's unclear how many bottles are in each lot, but medicine batches typically contain many thousands of pills. The 80-milligram strength tablets are not affected.

Ranbaxy spokesman Chuck Caprariello did not answer questions or provide any additional information beyond the statement on the company's website.